Corner-clamp for concrete forms



0. C. NILSON.

CORNER CLAMP FOR CONCRETE RORMS.

APPLLCATION FILED JUNE 11, 1921.

1,408,021, Patented Feb. 28, 1922.

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R 4 ATTORNEa UNITED STATES OLIVER CURTIS NILSON, OF OARTHAGE, MISSOURI.

CORNER-CLAMP non oononn'rn roams.

Application filed June 11, 1921.

To all whom it may concern.

Be it known that I, OLIVER CURTIS N ILSON, a citizen of the United States, residing at Carthage, in the county of Jasper and State of Missouri, have invented certain new and useful Improvements in Corner Clamps for Concrete Forms, of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to a clamp device,

Figure l is a plan view of a concrete form showing my clamp devices on the corners thereof.

Figure 2 is a fragmentary, perspective view of a concrete form showing my clamping device thereon.

Figure 3 is a perspective view of my clamping device shown in an unset or unlocked position.

Figure 4 is a fragmentary plan view of my clamp.

Referring to the drawings by numerals, l designates the sections of a concrete form, and 2 are my clamping devices on the corners of the form, holding the parts 1 securely together.

The clamp device comprises a Ll-shaped frame 3 formed of comparatively heavy material, and pivotally mounted on the outer ends of the frame 3 is an outer jaw 4 and an inner jaw 5. Each jaw 4C and 5 is substantially U-shaped, and its ends extend through the frame 3 and are bent back upon itself, as at 6, forming hooked ends upon each jaw, whereby the jaws are free to swing upon the frame 3, but w1ll positively be prevented from displacement off the frame.

Specification of Letters Patent.

Patented Feb. 28, 1922.

Serial No. 476,663.

The outer jaw a is adapted to swing over the frame 3, also over the inner jaw 5 to a limited extent. The inner jaw 5 swings within the frame 3 to a limited extent, so that the placing of a clamp device upon the corners of the concrete form can be accomplished to a nicety.

The placing of the clamp device upon a corner of the concrete form, constituted by the sections 1, is accomplished by placing the jaws in position as shown in Fig. 1, then driving nails 7 into the sections behind the outer portions of the jaws, then swinging the frame 3 in the direction indicated by thearrow 8 (Fig. 1) whereupon the jaws'will be drawn tight, holding the abutting ends of the sections 1 together duringthe operation, or the use of the forms.

While I have described the preferred em bodiment of my invention, and have illustrated the same in the accompanying drawings, certain minor changes or alterations may appear to one skilled in the art to which this invention relates, during the eX- tensive manufacture of the same and I, therefore, reserve the right to make such alterations or changes as shall fairly fall within the scope of the appended claim.

Vhat I claim is In a clamp of the character described, the combination of a U-shaped frame formed from a flat strip of material. the side arms of the frame having flat surfaces and being straight throughout their entire lengths, outer and inner U-shaped jaws formed from single strands of material, the end portions of said jaws extending through the side arms of said frame, the end portions of the outer 'aw bein bent to form substantially U-shaped inwardly extending hooks, the end portions of said inner jaw being bent to form substantially L -shaped outwardly extending hooks, whereby the end portions of the jaws are positively held from accidentally disengaging said frame, regardless of wear and severe usage, as and for the purposes set forth.

In testimony whereof I hereunto affix my signature.

OLIVER CURTIS N ILSON. 

